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nachgot
Joined: 24 May 2010
Posts: 7
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| LCD+ADC ON PIC16F877a WORK FINE SIMULATION, BUT NOT IN BOARD |
 Posted: Tue May 25, 2010 2:44 pm |
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hi, I need a help with my PIC program.
The program read ADC channel, and i need to send the value to lcd, what i can view the value on lcd?
This is my main code:
| Code: |
#include <16f877a.h>
#device adc=10
#use delay(clock=4000000)
#fuses XT,NOWDT,PUT
#include <mod_lcd2.c>
void inttoc(int aa){
for (i=0;i=4;i++){
}
main(){
long int valor;
int32 val32;
setup_ADC_ports (RA0_Analog);
setup_adc(ADC_CLOCK_INTERNAL);
set_adc_channel(0);
lcd_ini();
while(TRUE){
valor=read_adc();
if (valor) valor +=1;
val32= (valor*4+((int32)valor * 113)/128);
lcd_escreve("\f");
lcd_escreve("Valor: ");
lcd_escreve(("%d",val32));
delay_ms(2000);
}
}
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This is my library code:
| Code: |
/********************************************************/
/* MOD_LCD.C - Biblioteca de manipulação de módulo LCD */
/* */
/* Autor: Fábio Pereira */
/* */
/********************************************************/
// As definições a seguir são utilizadas para acesso aos pinos do display
#ifndef lcd_enable
#define lcd_enable pin_d1 // pino enable do LCD
#define lcd_rs pin_d0 // pino rs do LCD
#define lcd_d4 pin_d4 // pino de dados d4 do LCD
#define lcd_d5 pin_d5 // pino de dados d5 do LCD
#define lcd_d6 pin_d6 // pino de dados d6 do LCD
#define lcd_d7 pin_d7 // pino de dados d7 do LCD
#endif
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 linhas
#define lcd_seg_lin 0x40 // Endereço da segunda linha na RAM do LCD
// a constante abaixo define a seqüência de inicialização do módulo LCD
byte CONST INI_LCD[4] = {0x20 | (lcd_type << 2), 0xf, 1, 6};
void lcd_envia_nibble( byte dado )
// envia um dado de quatro bits para o display
{
// coloca os quatro bits nas saidas
output_bit(lcd_d4,bit_test(dado,0));
output_bit(lcd_d5,bit_test(dado,1));
output_bit(lcd_d6,bit_test(dado,2));
output_bit(lcd_d7,bit_test(dado,3));
// dá um pulso na linha enable
output_high(lcd_enable);
output_low(lcd_enable);
}
void lcd_envia_byte( boolean endereco, byte dado )
{
// coloca a linha rs em 0
output_low(lcd_rs);
// aguarda o display ficar desocupado
//while ( bit_test(lcd_le_byte(),7) ) ;
// configura a linha rs dependendo do modo selecionado
output_bit(lcd_rs,endereco);
delay_us(100); // aguarda 100 us
// caso a linha rw esteja definida, coloca em 0
// desativa linha enable
output_low(lcd_enable);
// envia a primeira parte do byte
lcd_envia_nibble(dado >> 4);
// envia a segunda parte do byte
lcd_envia_nibble(dado & 0x0f);
}
void lcd_ini()
// rotina de inicialização do display
{
byte conta;
output_low(lcd_d4);
output_low(lcd_d5);
output_low(lcd_d6);
output_low(lcd_d7);
output_low(lcd_rs);
output_low(lcd_enable);
delay_ms(15);
// envia uma seqüência de 3 vezes 0x03
// e depois 0x02 para configurar o módulo
// para modo de 4 bits
for(conta=1;conta<=3;++conta)
{
lcd_envia_nibble(3);
delay_ms(5);
}
lcd_envia_nibble(2);
// envia string de inicialização do display
for(conta=0;conta<=3;++conta) lcd_envia_byte(0,INI_LCD[conta]);
}
void lcd_pos_xy( byte x, byte y)
{
byte endereco;
if(y!=1)
endereco = lcd_seg_lin;
else
endereco = 0;
endereco += x-1;
lcd_envia_byte(0,0x80|endereco);
}
void lcd_escreve( char c)
// envia caractere para o display
{
switch (c)
{
case '\f' : lcd_envia_byte(0,1);
delay_ms(2);
break;
case '\n' :
case '\r' : lcd_pos_xy(1,2);
break;
case '\b' : lcd_envia_byte(0,0x10);
break;
default : lcd_envia_byte(1,c);
break;
}
} |
Thanks for all!! 
Last edited by nachgot on Wed May 26, 2010 1:41 pm; edited 2 times in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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nachgot
Joined: 24 May 2010
Posts: 7
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| RESOLVED! |
| Posted: Tue May 25, 2010 3:13 pm |
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Thanks PCM! |
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nachgot
Joined: 24 May 2010
Posts: 7
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| library |
| Posted: Wed May 26, 2010 1:40 pm |
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This code works fine in my simulation in Proteus.
But in my protoboard, doesn't work...
My LCD use a KS0066U microcontroller, and i use a PIC 16F877A for project. 
The LCD power up, but not appear the text.
I need a library for this microcontroller LCD or, a 8 bit library, for test in my protoboard again!
Thanks! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed May 26, 2010 3:04 pm |
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Check the connections between the PIC and the LCD.
Check the contrast voltage on the LCD. Set it for 0.4 volts. |
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nachgot
Joined: 24 May 2010
Posts: 7
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| Posted: Thu May 27, 2010 6:21 am |
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The connections between LCD and PIC, are all ok.
I used other port of PIC, with a LED, to test the clock too...And the led is blinking.
The contrast, i used a 10K potentiometer, and the LCD does not display characters...
My LCD display is: APEX AXSC162A, this library, works fine with my LCD?
I need the 8 bit library, to test again with my LCD.
Thank You! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu May 27, 2010 11:52 am |
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1. Post a list of the connections between the PIC and the LCD.
2. Post the #define statements that you have at the top of the Flex lcd driveres. |
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Abdulla M.A.
Joined: 28 Mar 2010
Posts: 30
Location: Baghdad, Iraq
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| Posted: Thu May 27, 2010 12:05 pm |
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When you turn on the circuit, is there any segments or cursor appear
on the LCD???
did you set the LCD setting, like
1-clear LCD.
2-set cursor at location 0.
3- number of used lines.
..........
Abdulla
_________________
"A scientist can discover a new star, but he cannot make one. He would have to ask an engineer to do that."
"For an optimist the glass is half full, for a pessimist it's half empty, and for an engineer is twice bigger than necessary." |
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nachgot
Joined: 24 May 2010
Posts: 7
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| Posted: Thu May 27, 2010 2:23 pm |
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If i turn on the circuit, the lcd will turn on the backlight, and doesn't appear nothing...
Yes, i have set my LCD correctly...
RD4 -> D4
RD5 -> D5
RD6 -> D6
RD7 -> D7
RD0 -> RS
RD1 -> E
Ground -> D0,D1,D2,D3,RW
I don't have idea, whats the problem.
I tested with other 2 LCD Display 16x2, but anything is the same problem |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19365
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| Posted: Thu May 27, 2010 2:37 pm |
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Look again at the bias connection. If you apply power to an LCD of this sort, with _nothing_ sent to it from a processor, it'll normally wake up displaying one line of black squares. If these are not visible, it implies the bias voltage is not right.
Do you have a data sheet for this display?. The only reference a quick search for ASXC162 returned, was for a graphical LCD, not a character LCD, which the driver you are trying to use is for....
Best Wishes |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu May 27, 2010 2:38 pm |
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| Quote: | | Ground -> D0,D1,D2,D3,RW |
1. You don't have to connect pins D0-D3 to ground. The LCD has
internal pull-ups on those pins. They are not floating.
2. Did you edit the Flex LCD driver to comment out this line ?
| Quote: | | // #define USE_RW_PIN 1 |
If you ground the R/W pin, you must comment out that line,
as shown above.
For Ttelmah,
This link shows it's a 16x2 LCD:
http://www.apexdisplay.com/products/stn/character/162.php.htm |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19365
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| Posted: Thu May 27, 2010 3:01 pm |
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I'm only finding it in EE-Times Asia, as a 128*64.
Thanks for the link that it is a character display. :-)
Best Wishes |
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nachgot
Joined: 24 May 2010
Posts: 7
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| Posted: Thu May 27, 2010 9:15 pm |
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| Ttelmah wrote: | Look again at the bias connection. If you apply power to an LCD of this sort, with _nothing_ sent to it from a processor, it'll normally wake up displaying one line of black squares. If these are not visible, it implies the bias voltage is not right.
Do you have a data sheet for this display?. The only reference a quick search for ASXC162 returned, was for a graphical LCD, not a character LCD, which the driver you are trying to use is for....
Best Wishes |
The one line of black squares appear.
But only this.
AXSC162, uses KS066U controller. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu May 27, 2010 10:17 pm |
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Black squares means the LCD is not initialized, or is not initialized correctly.
1. Post the #define statements that you have at the top of the Flex lcd driver file.
2. Did you edit the Flex LCD driver to comment out this line ?
| Quote: | | // #define USE_RW_PIN 1 |
If you ground the R/W pin, you must comment out that line,
as shown above. |
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nachgot
Joined: 24 May 2010
Posts: 7
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| Posted: Fri May 28, 2010 2:35 pm |
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#define LCD_DB4 PIN_D4
#define LCD_DB5 PIN_D5
#define LCD_DB6 PIN_D6
#define LCD_DB7 PIN_D7
#define LCD_E PIN_D1
#define LCD_RS PIN_D0
//#define LCD_RW PIN_A2
// If you only want a 6-pin interface to your LCD, then
// connect the R/W pin on the LCD to ground, and comment
// out the following line.
//#define USE_LCD_RW 1
//========================================
#define lcd_type 2 // 0=5x7, 1=5x10, 2=2 lines
#define lcd_line_two 0x40 // LCD RAM address for the 2nd line |
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